Taxonomy Delegate

This module allows an administrator with "administer taxonomy" permission to delegate the administration of a vocabulary to a non-admin role.

The role to which this authoity has been delegated may add, modify, and delete terms from a vocabulary. They may, not however, modify the vocabulary itself, nor may they create new vocabularies.

Given that Forums are controlled by a vocabulary, one might give the ability to control them to someone who has no other administrative rights. They can then change the "containers" (parent terms) and forums (child terms). Another popular module that is vocabulary driven is Image Gallery, so it's another function that can be easily delegated. There are many ways in which this module can help.